package cz.muni.fi.xvano1.trinity.servlets;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * This class is a servlet which has mapped URL "/Index". This is the base
 * servlet which evaluates whether request are queried against specific
 * activity. If user sends request to activities that are unknown or without
 * activity attributes, he will be redirected to URL /Home.
 *
 * @author Jan Vano
 */
public class IndexServlet extends HttpServlet {

    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        if (request.getSession().getAttribute("user") == null) {
            request.getSession().setAttribute("user", request.getAttribute("loggedUser"));
            if (request.getSession().getAttribute("infiniteOne") == null) {
                request.getSession().setAttribute("infiniteOne", new Object());
            } else {
                if (request.getSession().getAttribute("infiniteTwo") == null) {
                    request.getSession().setAttribute("infiniteTwo", new Object());
                } else {
                    PrintWriter output = response.getWriter();
                    output.println("System was unable to authenticate user. Please "
                            + "contact administrator.");
                    request.getSession().removeAttribute("infiniteOne");
                    request.getSession().removeAttribute("infiniteTwo");
                    return;
                }
            }
        }

        if (request.getAttribute("action") == null) {
            String url = request.getScheme()
                    + "://" + request.getServerName()
                    + ":" + request.getServerPort()
                    + request.getContextPath()
                    + "/" + "Home";
            response.sendRedirect(url);
            return;
        }

//        if ("homepage".equals(request.getAttribute("action"))) {
//            request.removeAttribute("action");
//        }

        Cookie cookie = new Cookie("logged", "am");
        cookie.setMaxAge(-1);
        response.addCookie(cookie);
        prepareHeaders(request);
        request.getRequestDispatcher("/viewer.jsp").forward(request, response);

    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

    /**
     * Thid method sets minor parameters of index page.
     * Method is currently not used
     *
     * @param request User request
     */
    private void prepareHeaders(HttpServletRequest request) {
//        request.setAttribute("title", "Trinity");
    }
}
